Re: LISTAGG à la Oracle in PostgreSQL

I agree but I just would like to know if there is way to be compatible 
with Oracle syntax using aggregate features in PostgreSQL

Thanks.

Le 09/03/2026 à 23:05, Paul A Jungwirth a écrit :
> On Mon, Mar 9, 2026 at 1:21 PM Pierre Forstmann
> <pierre.forstmann@gmail.com> wrote:
>> Hello,
>>
>> I can write a LISTAGG aggregate for:
>>
>> create table emp(deptno numeric, ename text);
>>
>> SELECT deptno, LISTAGG(ename, ','::text ORDER BY ename) AS employees
>> FROM   emp GROUP BY deptno ORDER BY deptno;
>>
>> I would like to know if is possible to create an aggregate LISTAGG that
>> would work like in Oracle:
>>
>> SELECT deptno,
>>          listagg(ename, ',') WITHIN GROUP (ORDER BY ename) AS employees
>> FROM emp
>> GROUP BY deptno
>> ORDER BY deptno;
> I don't think you need a custom aggregate here. In Postgres you can say:
>
> select deptno,
>        string_agg(ename, ',' ORDER BY ename) AS employees
> FROM emp
> GROUP BY deptno
> ORDER BY deptno;
>